Electrochemical recovery of hydrogen and elemental sulfur from hydrogen sulfide gas by two-cell system
Electrochemical recovery of hydrogen and elemental sulfur from hydrogen sulfide gas by two-cell system
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双电池系统从硫化氢气体中电化学回收氢气和元素硫
DOI：
10.1080/15567036.2019.1680766
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
N. Balasubramanian
中科院分区：
文献类型：
--
作者：
J. Narendranath;J. Manokaran;S. Sundar;R. Muruganantham;A. Shoaibi;C. Srinivasakannan;N. Balasubramanian
摘要尽管工业界为切实可行的节能作出了巨大的投资，但节能的方法仍然落后，工业界仍然在寻找替代品。石油和天然气作业持续存在的主要问题是在工艺的初始或后期阶段经常或无意地排放硫化氢。因此，本研究以石墨为阴阳极，甘汞为参比电极，对从硫化氢中回收硫和氢的间接电解进行了研究。使用高分辨率扫描电子显微镜分析回收的硫，其在几微米的范围内，这与X射线衍射分析一致，证实了硫的晶体正交结构（JCPDS卡号89 -2600）。通过以50 mVs-1的扫描速率扫描-1.2 V和+1.2 V之间的电势进行循环伏安法实验，获得0.41 A/cm 2的最大电流密度。在pH 13、电流密度为0.23 A/cm 2和温度为80°C时观察到硫的最大沉积。间接电解法回收硫的量为2.9 mg，回收率为90.44%，为从H2S中制取结晶硫和氢气提供了一种有效的方法。
ABSTRACT In spite of industries making huge investments, for a viable energy saving, still the methods for conservation of energy are lagging and the industries are still in search for alternatives. The major concern that persists with the oil and gas operations is emission of hydrogen sulfide, frequently or inadvertently, during the initial or later stages of the process. Hence, this study focuses on the indirect electrolysis toward the recovery of sulfur and hydrogen from hydrogen sulfide using graphite as both anode and cathode with calomel as reference electrode. The recovered sulfur was analyzed using high-resolution scanning electron microscope was in range of few microns that was in agreement with the X-ray diffraction analysis confirming the crystalline orthorhombic structure of sulfur (JCPDS Card no.89–2600). The cyclic voltammetry experiment was carried out by sweeping the potential between −1.2 and +1.2 V at a scan rate of 50 mVs−1 obtaining a maximum current density of 0.41 A/cm2. Maximum deposition of sulfur observed at pH 13 with a current density of 0.23 A/cm2 and temperature 80°C. The quantity of sulfur recovered by indirect electrolysis was in the range of 2.9 mg with efficiency of 90.44%.Thus an effective method using indirect electrolysis method was successfully used to achieve crystalline sulfur and hydrogen from H2S.